terraform.azure.security.azure-cosmosdb-disables-public-network.azure-cosmosdb-disables-public-network

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Ensure that Azure Cosmos DB disables public network access

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Defintion

rules:
  - id: azure-cosmosdb-disables-public-network
    message: Ensure that Azure Cosmos DB disables public network access
    patterns:
      - pattern: resource
      - pattern-not-inside: |
          resource "azurerm_cosmosdb_account" "..." {
          ...
          public_network_access_enabled = false
          ...
          }
      - pattern-inside: |
          resource "azurerm_cosmosdb_account" "..." {
          ...
          }
    metadata:
      owasp:
        - A05:2017 - Broken Access Control
        - A01:2021 - Broken Access Control
      cwe:
        - "CWE-284: Improper Access Control"
      category: security
      technology:
        - terraform
        - azure
      references:
        - https://owasp.org/Top10/A01_2021-Broken_Access_Control
      subcategory:
        - audit
      likelihood: LOW
      impact: LOW
      confidence: LOW
      license: Commons Clause License Condition v1.0[LGPL-2.1-only]
      vulnerability_class:
        - Improper Authorization
    languages:
      - hcl
    severity: WARNING

Examples

azure-cosmosdb-disables-public-network.tf

# fail
# ruleid: azure-cosmosdb-disables-public-network
resource "azurerm_cosmosdb_account" "db" {
    name                = "tfex-cosmos-db-${random_integer.ri.result}"
    location            = azurerm_resource_group.rg.location
    resource_group_name = azurerm_resource_group.rg.name
    offer_type          = "Standard"
    kind                = "GlobalDocumentDB"

    enable_automatic_failover = true

    capabilities {
    name = "EnableAggregationPipeline"
    }

    capabilities {
    name = "mongoEnableDocLevelTTL"
    }

    capabilities {
    name = "MongoDBv3.4"
    }

    consistency_policy {
    consistency_level       = "BoundedStaleness"
    max_interval_in_seconds = 10
    max_staleness_prefix    = 200
    }

    geo_location {
    location          = var.failover_location
    failover_priority = 1
    }

    geo_location {
    location          = azurerm_resource_group.rg.location
    failover_priority = 0
    }
}

# fail
# ruleid: azure-cosmosdb-disables-public-network
resource "azurerm_cosmosdb_account" "db" {
    name                = "tfex-cosmos-db-${random_integer.ri.result}"
    location            = azurerm_resource_group.rg.location
    resource_group_name = azurerm_resource_group.rg.name
    offer_type          = "Standard"
    kind                = "GlobalDocumentDB"

    public_network_access_enabled = true
    enable_automatic_failover = true

    capabilities {
      name = "EnableAggregationPipeline"
    }

    capabilities {
      name = "mongoEnableDocLevelTTL"
    }

    capabilities {
      name = "MongoDBv3.4"
    }

    consistency_policy {
      consistency_level       = "BoundedStaleness"
      max_interval_in_seconds = 10
      max_staleness_prefix    = 200
    }

    geo_location {
      location          = var.failover_location
      failover_priority = 1
    }

    geo_location {
      location          = azurerm_resource_group.rg.location
      failover_priority = 0
    }

    key_vault_key_id = "A versionless Key Vault Key ID for CMK encryption"
}

# pass
resource "azurerm_cosmosdb_account" "db" {
    name                = "tfex-cosmos-db-${random_integer.ri.result}"
    location            = azurerm_resource_group.rg.location
    resource_group_name = azurerm_resource_group.rg.name
    offer_type          = "Standard"
    kind                = "GlobalDocumentDB"

    public_network_access_enabled = false
    enable_automatic_failover = true

    capabilities {
      name = "EnableAggregationPipeline"
    }

    capabilities {
      name = "mongoEnableDocLevelTTL"
    }

    capabilities {
      name = "MongoDBv3.4"
    }

    consistency_policy {
      consistency_level       = "BoundedStaleness"
      max_interval_in_seconds = 10
      max_staleness_prefix    = 200
    }

    geo_location {
      location          = var.failover_location
      failover_priority = 1
    }

    geo_location {
      location          = azurerm_resource_group.rg.location
      failover_priority = 0
    }

    key_vault_key_id = "A versionless Key Vault Key ID for CMK encryption"
}